The new \N regex escape

At the French Perl Workshop 2009, a talk on Perl 6 parsing by Stéphane Payrard reminded me of the existence of \N in Perl 6. It's a regex escape that is the exact opposite of \n : it will match any character that is not a newline, independently from the presence or absence of the single line match modifier /s. So I have now added it in Perl 5. This is my first feature contribution to the regex engine!